Officially, the mayoralty of San Antonio-like many other municipal offices in Texas-is nonpartisan. But last year San Antonio's mayor, Julian Castro, displayed his colours on the nation's big political stage by giving the keynote address at the Democratic National Convention. Like most political keynotes, Mr Castro's was an utterly unmemorable torrent of boilerplate (he took brave stands in favour of education, family, America and hard work). Still, Mr Castro feared the speech would hurt him at the polls: Republicans in San Antonio would either stay home or pull the lever for one of his opponents.
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